210000021093 has 20 divisors (see below), whose sum is σ = 313804626828. Its totient is φ = 139954988160.

The previous prime is 210000021083. The next prime is 210000021107. The reversal of 210000021093 is 390120000012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18697007169 + 191303013924 = 136737^2 + 437382^2 .

It is not a de Polignac number, because 210000021093 - 2⁵ = 210000021061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210000021013) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 162546 + ... + 668147.

Almost surely, 2^210000021093 is an apocalyptic number.

It is an amenable number.

210000021093 is a deficient number, since it is larger than the sum of its proper divisors (103804605735).

210000021093 is an equidigital number, since it uses as much as digits as its factorization.

210000021093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833826 (or 833817 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The spelling of 210000021093 in words is "two hundred ten billion, twenty-one thousand, ninety-three".